import "reflect-metadata"
import { expect } from "chai"
import { DataSource } from "../../src/data-source/DataSource"
import { Repository } from "../../src/repository/Repository"
import { PostDetails } from "../../sample/sample2-one-to-one/entity/PostDetails"
import { Post } from "../../sample/sample2-one-to-one/entity/Post"
import { PostCategory } from "../../sample/sample2-one-to-one/entity/PostCategory"
import { PostAuthor } from "../../sample/sample2-one-to-one/entity/PostAuthor"
import { PostMetadata } from "../../sample/sample2-one-to-one/entity/PostMetadata"
import { PostImage } from "../../sample/sample2-one-to-one/entity/PostImage"
import { PostInformation } from "../../sample/sample2-one-to-one/entity/PostInformation"
import { setupSingleTestingConnection } from "../utils/test-utils"

describe("one-to-one", function () {
    // -------------------------------------------------------------------------
    // Configuration
    // -------------------------------------------------------------------------

    // connect to db
    let dataSource: DataSource
    before(async function () {
        const options = setupSingleTestingConnection("mysql", {
            entities: [
                Post,
                PostDetails,
                PostCategory,
                PostMetadata,
                PostImage,
                PostInformation,
                PostAuthor,
            ],
        })
        if (!options) return

        dataSource = new DataSource(options)
        await dataSource.initialize()
    })

    after(() => dataSource.destroy())

    // clean up database before each test
    function reloadDatabase() {
        if (!dataSource) return
        return dataSource.synchronize(true)
    }

    let postRepository: Repository<Post>,
        postDetailsRepository: Repository<PostDetails>,
        postCategoryRepository: Repository<PostCategory>,
        postImageRepository: Repository<PostImage>,
        postMetadataRepository: Repository<PostMetadata>
    before(function () {
        if (!dataSource) return

        postRepository = dataSource.getRepository(Post)
        postDetailsRepository = dataSource.getRepository(PostDetails)
        postCategoryRepository = dataSource.getRepository(PostCategory)
        postImageRepository = dataSource.getRepository(PostImage)
        postMetadataRepository = dataSource.getRepository(PostMetadata)
    })

    // -------------------------------------------------------------------------
    // Specifications
    // -------------------------------------------------------------------------

    describe("insert post and details (has inverse relation + full cascade options)", function () {
        if (!dataSource) return

        let newPost: Post, details: PostDetails, savedPost: Post

        before(reloadDatabase)

        before(function () {
            details = new PostDetails()
            details.authorName = "Umed"
            details.comment = "this is post"
            details.metadata = "post,posting,postman"

            newPost = new Post()
            newPost.text = "Hello post"
            newPost.title = "this is post title"
            newPost.details = details
            return postRepository
                .save(newPost)
                .then((post) => (savedPost = post as Post))
        })

        it("should return the same post instance after its created", function () {
            savedPost.should.be.equal(newPost)
        })

        it("should return the same post details instance after its created", function () {
            savedPost.details!.should.be.equal(newPost.details)
        })

        it("should have a new generated id after post is created", function () {
            expect(savedPost.id).not.to.be.undefined
            expect(savedPost.details!.id).not.to.be.undefined
        })

        it("should have inserted post in the database", function () {
            if (!dataSource) return
            const expectedPost = new Post()
            expectedPost.id = savedPost.id
            expectedPost.text = savedPost.text
            expectedPost.title = savedPost.title

            return postRepository
                .findOneBy({
                    id: savedPost.id,
                })
                .should.eventually.eql(expectedPost)
        })

        it("should have inserted post details in the database", async function () {
            if (!dataSource) return
            const expectedDetails = new PostDetails()
            expectedDetails.id = savedPost.details!.id
            expectedDetails.authorName = savedPost.details!.authorName
            expectedDetails.comment = savedPost.details!.comment
            expectedDetails.metadata = savedPost.details!.metadata

            const loadedPostDetails = await postDetailsRepository.findOneBy({
                id: savedPost.details!.id,
            })
            loadedPostDetails!.should.be.eql(expectedDetails)
        })

        it("should load post and its details if left join used", async function () {
            if (!dataSource) return
            const expectedPost = new Post()
            expectedPost.id = savedPost.id
            expectedPost.text = savedPost.text
            expectedPost.title = savedPost.title
            expectedPost.details = new PostDetails()
            expectedPost.details!.id = savedPost.details!.id
            expectedPost.details!.authorName = savedPost.details!.authorName
            expectedPost.details!.comment = savedPost.details!.comment
            expectedPost.details!.metadata = savedPost.details!.metadata

            const post = await postRepository
                .createQueryBuilder("post")
                .leftJoinAndSelect("post.details", "details")
                .where("post.id=:id")
                .setParameter("id", savedPost.id)
                .getOne()

            expect(post).not.to.be.null
            post!.should.eql(expectedPost)
        })

        it("should load details and its post if left join used (from reverse side)", function () {
            if (!dataSource) return

            const expectedDetails = new PostDetails()
            expectedDetails.id = savedPost.details!.id
            expectedDetails.authorName = savedPost.details!.authorName
            expectedDetails.comment = savedPost.details!.comment
            expectedDetails.metadata = savedPost.details!.metadata

            expectedDetails.post = new Post()
            expectedDetails.post.id = savedPost.id
            expectedDetails.post.text = savedPost.text
            expectedDetails.post.title = savedPost.title

            return postDetailsRepository
                .createQueryBuilder("details")
                .leftJoinAndSelect("details.post", "post")
                .where("details.id=:id")
                .setParameter("id", savedPost.id)
                .getOne()
                .should.eventually.eql(expectedDetails)
        })

        it("should load saved post without details if left joins are not specified", function () {
            const expectedPost = new Post()
            expectedPost.id = savedPost.id
            expectedPost.text = savedPost.text
            expectedPost.title = savedPost.title

            return postRepository
                .createQueryBuilder("post")
                .where("post.id=:id", { id: savedPost.id })
                .getOne()
                .should.eventually.eql(expectedPost)
        })

        it("should load saved post without details if left joins are not specified", function () {
            const expectedDetails = new PostDetails()
            expectedDetails.id = savedPost.details!.id
            expectedDetails.authorName = savedPost.details!.authorName
            expectedDetails.comment = savedPost.details!.comment
            expectedDetails.metadata = savedPost.details!.metadata

            return postDetailsRepository
                .createQueryBuilder("details")
                .where("details.id=:id", { id: savedPost.id })
                .getOne()
                .should.eventually.eql(expectedDetails)
        })

        it("should load post and its details with no hangup if query used", async function () {
            if (!dataSource) return
            const expectedPost = new Post()
            expectedPost.id = savedPost.id
            expectedPost.text = savedPost.text
            expectedPost.title = savedPost.title
            expectedPost.details = new PostDetails()
            expectedPost.details!.id = savedPost.details!.id
            expectedPost.details!.authorName = savedPost.details!.authorName
            expectedPost.details!.comment = savedPost.details!.comment
            expectedPost.details!.metadata = savedPost.details!.metadata

            const findOne = () => postRepository.findOne({
                    where: {
                        id: savedPost.id
                    },
                    relations: {
                        details: true
                    },
                    relationLoadStrategy: "query"
                })

            const posts = await Promise.all([
                findOne(),
                findOne(),
                findOne(),
                findOne(),
                findOne(),
                findOne(),
                findOne(),
                findOne(),
                findOne(),
                findOne(),
            ])

            posts.forEach(post => {
                expect(post).not.to.be.null
                post!.should.eql(expectedPost)
            })
        })
    })

    describe("insert post and category (one-side relation)", function () {
        if (!dataSource) return

        let newPost: Post, category: PostCategory, savedPost: Post

        before(reloadDatabase)

        before(function () {
            category = new PostCategory()
            category.name = "technology"

            newPost = new Post()
            newPost.text = "Hello post"
            newPost.title = "this is post title"
            newPost.category = category

            return postRepository
                .save(newPost)
                .then((post) => (savedPost = post as Post))
        })

        it("should return the same post instance after its created", function () {
            savedPost.should.be.equal(newPost)
        })

        it("should return the same post category instance after its created", function () {
            savedPost.category.should.be.equal(newPost.category)
        })

        it("should have a new generated id after post is created", function () {
            expect(savedPost.id).not.to.be.undefined
            expect(savedPost.category.id).not.to.be.undefined
        })

        it("should have inserted post in the database", function () {
            const expectedPost = new Post()
            expectedPost.id = savedPost.id
            expectedPost.text = savedPost.text
            expectedPost.title = savedPost.title
            return postRepository
                .findOneBy({
                    id: savedPost.id,
                })
                .should.eventually.eql(expectedPost)
        })

        it("should have inserted category in the database", function () {
            const expectedPost = new PostCategory()
            expectedPost.id = savedPost.category.id
            expectedPost.name = "technology"
            return postCategoryRepository
                .findOneBy({
                    id: savedPost.category.id,
                })
                .should.eventually.eql(expectedPost)
        })

        it("should load post and its category if left join used", function () {
            const expectedPost = new Post()
            expectedPost.id = savedPost.id
            expectedPost.title = savedPost.title
            expectedPost.text = savedPost.text
            expectedPost.category = new PostCategory()
            expectedPost.category.id = savedPost.category.id
            expectedPost.category.name = savedPost.category.name

            return postRepository
                .createQueryBuilder("post")
                .leftJoinAndSelect("post.category", "category")
                .where("post.id=:id", { id: savedPost.id })
                .getOne()
                .should.eventually.eql(expectedPost)
        })

        it("should load details and its post if left join used (from reverse side)", function () {
            // later need to specify with what exception we reject it
            /*return postCategoryRepository
                .createQueryBuilder("category")
                .leftJoinAndSelect("category.post", "post")
                .where("category.id=:id", { id: savedPost.id })
                .getSingleResult()
                .should.be.rejectedWith(Error);*/
            // not working, find fix
        })
    })

    describe("cascade updates should not be executed when cascadeUpdate option is not set", function () {
        if (!dataSource) return
        let newPost: Post, details: PostDetails

        before(reloadDatabase)

        before(function () {
            details = new PostDetails()
            details.authorName = "Umed"
            details.comment = "this is post"
            details.metadata = "post,posting,postman"

            newPost = new Post()
            newPost.text = "Hello post"
            newPost.title = "this is post title"
            newPost.details = details

            return postRepository.save(newPost)
        })

        it("should ignore updates in the model and do not update the db when entity is updated", function () {
            newPost.details!.comment = "i am updated comment"
            return postRepository
                .save(newPost)
                .then((updatedPost) => {
                    updatedPost.details!.comment!.should.be.equal(
                        "i am updated comment",
                    )
                    return postRepository
                        .createQueryBuilder("post")
                        .leftJoinAndSelect("post.details", "details")
                        .where("post.id=:id")
                        .setParameter("id", updatedPost.id)
                        .getOne()
                })
                .then((updatedPostReloaded) => {
                    updatedPostReloaded!.details!.comment.should.be.equal(
                        "this is post",
                    )
                })
        }) // todo: also check that updates throw exception in strict cascades mode
    })

    describe("cascade remove should not be executed when cascadeRemove option is not set", function () {
        if (!dataSource) return
        let newPost: Post, details: PostDetails

        before(reloadDatabase)

        before(function () {
            details = new PostDetails()
            details.authorName = "Umed"
            details.comment = "this is post"
            details.metadata = "post,posting,postman"

            newPost = new Post()
            newPost.text = "Hello post"
            newPost.title = "this is post title"
            newPost.details = details

            return postRepository.save(newPost)
        })

        it("should ignore updates in the model and do not update the db when entity is updated", function () {
            if (!dataSource) return
            delete newPost.details
            return postRepository
                .save(newPost)
                .then((updatedPost) => {
                    return postRepository
                        .createQueryBuilder("post")
                        .leftJoinAndSelect("post.details", "details")
                        .where("post.id=:id")
                        .setParameter("id", updatedPost.id)
                        .getOne()
                })
                .then((updatedPostReloaded) => {
                    updatedPostReloaded!.details!.comment.should.be.equal(
                        "this is post",
                    )
                })
        })
    })

    // todo: check why it generates extra query
    describe("cascade updates should be executed when cascadeUpdate option is set", function () {
        if (!dataSource) return
        let newPost: Post, newImage: PostImage

        before(reloadDatabase)

        it("should update a relation successfully when updated", function () {
            newImage = new PostImage()
            newImage.url = "logo.png"

            newPost = new Post()
            newPost.text = "Hello post"
            newPost.title = "this is post title"

            return postImageRepository
                .save(newImage)
                .then((image) => {
                    newPost.image = image as PostImage
                    return postRepository.save(newPost)
                })
                .then((post) => {
                    newPost = post as Post
                    return postRepository
                        .createQueryBuilder("post")
                        .leftJoinAndSelect("post.image", "image")
                        .where("post.id=:id")
                        .setParameter("id", post.id)
                        .getOne()
                })
                .then((loadedPost) => {
                    loadedPost!.image.url = "new-logo.png"
                    return postRepository.save(loadedPost!)
                })
                .then(() => {
                    return postRepository
                        .createQueryBuilder("post")
                        .leftJoinAndSelect("post.image", "image")
                        .where("post.id=:id")
                        .setParameter("id", newPost.id)
                        .getOne()
                })
                .then((reloadedPost) => {
                    reloadedPost!.image.url.should.be.equal("new-logo.png")
                })
        })
    })

    describe("cascade remove should be executed when cascadeRemove option is set", function () {
        if (!dataSource) return
        let newPost: Post, newMetadata: PostMetadata

        before(reloadDatabase)

        it("should remove a relation entity successfully when removed", function () {
            newMetadata = new PostMetadata()
            newMetadata.description = "this is post metadata"

            newPost = new Post()
            newPost.text = "Hello post"
            newPost.title = "this is post title"

            return postMetadataRepository
                .save(newMetadata)
                .then((metadata) => {
                    newPost.metadata = metadata as PostMetadata
                    return postRepository.save(newPost)
                })
                .then((post) => {
                    newPost = post as Post
                    return postRepository
                        .createQueryBuilder("post")
                        .leftJoinAndSelect("post.metadata", "metadata")
                        .where("post.id=:id")
                        .setParameter("id", post.id)
                        .getOne()
                })
                .then((loadedPost) => {
                    loadedPost!.metadata = null
                    return postRepository.save(loadedPost!)
                })
                .then(() => {
                    return postRepository
                        .createQueryBuilder("post")
                        .leftJoinAndSelect("post.metadata", "metadata")
                        .where("post.id=:id")
                        .setParameter("id", newPost.id)
                        .getOne()
                })
                .then((reloadedPost) => {
                    expect(reloadedPost!.metadata).to.not.exist
                })
        })
    })
})
